D21 state road | ||||
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Map of Croatia with D21 highlighted in red
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Route information | ||||
Part of E751 | ||||
Maintained by Hrvatske ceste | ||||
Length: | 80.1 km (49.8 mi) | |||
Major junctions | ||||
North end: | Slovenian G11 at Kaštel border crossing to Slovenia | |||
South end: | D400 in Pula | |||
Location | ||||
Counties: | Istria | |||
Major cities: | Buje, Vodnjan, Pula | |||
Highway system | ||||
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D21 is a 80.1-kilometre-long (49.8 mi), north–south state road in Istria County, Croatia. A short section of D21 is a part of the European route E751. The northern terminus of the route is located at the Croatia–Slovenia border at the Dragonja River. There it connects to Koper, Slovenia, and Trieste, Italy, via the Slovene route G11 further north. D21 route is generally parallel to A9 motorway. The two form several junctions, either directly or via short connectors, at Buje, Bale and Vodnjan – towns served directly by D21. The southern terminus of the route is found in the city of Pula, at the southern tip of the Istrian Peninsula.
The road, as well as all other state roads in Croatia, is managed and maintained by Hrvatske ceste, a state-owned company. The road carries an annual average daily traffic of about 2,000 vehicles, and the traffic volume increases by up to 1,000 vehicles in summer as the road is used by tourists in the region. The southernmost portion of the road is significantly more congested as it carries Pula suburban traffic.